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PDF (Portable Document Format) was introduced back in 1990. That was the most reliable way to distribute information. PDF files are always viewed and printed in the same way.
How many PDF files
The web contains over 200 million PDF files today.
Why CARO stands for PDF
The original code name was Camelot. Then it was renamed to Carousel. That is why a PDF file had CARO file type on Macintosh.